package cfca.seal.util;

import com.google.zxing.common.BitMatrix;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import javax.imageio.ImageIO;

public final class MatrixToImageWriter
{
  private static final int BLACK = -16777216;
  private static final int WHITE = -1;

  public static BufferedImage toBufferedImage(BitMatrix matrix)
  {
    int width = matrix.getWidth();
    int height = matrix.getHeight();
    BufferedImage image = new BufferedImage(width, height, 1);
    for (int x = 0; x < width; x++) {
      for (int y = 0; y < height; y++) {
        image.setRGB(x, y, matrix.get(x, y) ? -16777216 : -1);
      }
    }
    return image;
  }

  public static void writeToFile(BitMatrix matrix, String format, File file)
    throws IOException
  {
    BufferedImage image = toBufferedImage(matrix);
    if (!ImageIO.write(image, format, file))
      throw new IOException("Could not write an image of format " + format + " to " + file);
  }

  public static void writeToStream(BitMatrix matrix, String format, OutputStream stream) throws IOException
  {
    BufferedImage image = toBufferedImage(matrix);
    if (!ImageIO.write(image, format, stream))
      throw new IOException("Could not write an image of format " + format);
  }
}